 Logan and Mac continue to make progress on his business school report , but Mac has to call Max ( Adam Rose ) to continue . Desmond goes skinny dipping at his party , while Mac and Max flirt in front of Logan . Veronica discovers that Desmond ’ s bag was actually switched with another person ’ s . Veronica and Piz retrieve it , and on the car ride home , they briefly discuss their kiss at the party before playing a CD with some of Desmond ’ s unreleased newer material . Keith reconnects with Leo D ’ Amato ( Max Greenfield ) , who presents a case involving the Fitzpatricks to him . They stake out where the Fitzpatricks are , and Keith sees Vinnie Van Lowe helping them . However , they quickly learn that Vinnie is actually investigating the case and has trapped them in the store . Veronica and Piz supposedly get stuck in traffic and tell Desmond to play some of his newer songs until they get there , but they actually are at the concert venue and just want him to expose the audience to his solo material . 
