▁they ▁leave ▁together . ▁He ▁became ▁father ▁to ▁the ▁tw ins ▁after ▁they ▁were ▁born ▁and ▁S ally ▁was ▁rest ing ▁at ▁San ctu ary , ▁so ▁as ▁to ▁protect ▁them ▁from ▁their ▁real ▁father . ▁In ▁the ▁fourth ▁book , ▁his ▁soul ▁and ▁that ▁of ▁S ally ' s ▁are ▁reun ited ▁and ▁appear ▁to ▁pass ▁over ▁together . ▁ ▁S ally ▁– ▁S ally ▁is ▁the ▁mother ▁of ▁the ▁tw ins . ▁She ▁was ▁a ▁don or ▁on ▁the ▁No ct ur ne , ▁a ▁don or ▁to ▁Sid orio . ▁Sid orio ▁was , ▁unknown ▁to ▁anyone ▁else ▁at ▁the ▁time , ▁in ▁love ▁with ▁S ally . ▁When ▁D ex ter ▁came ▁ab o ard ▁the ▁ship ▁with ▁plans ▁to ▁leave ▁it ▁with ▁her , ▁Sid orio ▁im pre gn ated ▁her ▁with ▁a ▁spell . ▁It ▁is ▁revealed ▁that ▁her ▁soul ▁is ▁one ▁of ▁the ▁one ' s ▁the ▁Captain ▁had ▁been ▁har bour ing . ▁ ▁Bibli ography ▁ ▁V amp ir ates ▁series ▁V amp ir ates : ▁Book ▁ 1 ▁Dem ons ▁of ▁the ▁Ocean ▁( 2 0 0 5 ) ▁V amp ir ates : ▁Dead ▁Deep ▁( short ▁story ), ▁ 2 0 0 7 ▁V amp ir ates : ▁Book ▁ 2 ▁T ide ▁of ▁T error ▁( 2 0 0 7 ) ▁V amp ir ates : ▁book ▁ 3 ▁Blood ▁Captain ▁( 2 0 0 8 ) ▁V amp ir ates : ▁Book ▁ 4 ▁Black ▁Heart ▁( 2 0