sub search {
    my ($self,$isbn) = @_;
    my %data;

    $self->found(0);
    $self->book(undef);

    my $post_url = "https://isbn.nu/".$isbn;
    my $mech = WWW::Mechanize->new();
    $mech->agent_alias( 'Linux Mozilla' );
    $mech->add_header( 'Accept-Encoding' => undef );

    eval { $mech->get( $post_url ) };
    return $self->handler("isbn.nu website appears to be unavailable.")
        if($@ || !$mech->success() || !$mech->content());