Look I don't know why these books appeal but they make me laugh!
From the Blurb:
Rainbow's got the blues. His girlfriend's dumped him; his assassin mate Rory's found God; his Aunt Rube's as sick as a bad joke; and his ex-wife's thrown up a barricade - all right, a cordon bleu - around his daughter Imogene.
So when a snake's let loose in a laboratory, his ballet teacher's under siege and a nasty little joker by the name of Cock Robin cops it, Rainbow climbs into the ring because it's his job - but also because he needs the distraction.